Abstract

This paper describes the designing pregroove dimensions to achieve stable data read-out. The spot size detection method and the push-pull method are used for focusing and tracking error signal detection, respectively. Experimental and theoretical results show that pregroove crosstalk and decrease in light intensity due to groove diffraction become smaller as the edge gradient of the pregroove decreases. The permissible range of the depth for a triangular pregroove is 40% larger than that of a rectangular pregroove. The triangular pregroove depth to attain the maximum tracking signal efficiency is about 100 nm for a refractive index of 1.5.

© 1986 Optical Society of America

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References

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  1. Y. Tsunoda, S. Horigome, Z. Tsutsumi, “Optical Digital Data Storage Technologies with Semiconductor Laser Head,” Proc. Soc. Photo-Opt. Instrum. Eng. 382, 24 (1983).
  2. O. Ito, K. Yoshimoto, I. Watanabe, T. Kubo, “Improvement of Focusing and Tracking Servos in Optical Disk Memory,” Soc. Photo-Opt. Instrum. Eng. 529, 145 (1985).
  3. H. Ukita, A. Watabe, K. Katoh, “MALS Head for Optical Recording,” in Technical Digest, Conference on Lasers and Electro-Optics (Optical Society of America, Washington, DC, 1983), paper WR2.
  4. H. H. Hopkins, “Diffraction Theory of Laser Read-out Systems for Optical Video Discs,” J. Opt. Soc. Am. 69, 4 (1979).
    [CrossRef]
  5. J. H. T. Pasman, H. F. Olijhok, B. Verkaik, “Developments in Optical Disk Mastering,” Proc. Soc. Photo-Opt. Instrum. Eng. 529, 61 (1985).
  6. T. Murakami, “Design of the Pregroove-Shape on an Optical Disk Based on the Light Diffraction Analysis,” Trans. Jpn. IECE J67-C, 2 (1984) (in Japanese).

1985 (2)

O. Ito, K. Yoshimoto, I. Watanabe, T. Kubo, “Improvement of Focusing and Tracking Servos in Optical Disk Memory,” Soc. Photo-Opt. Instrum. Eng. 529, 145 (1985).

J. H. T. Pasman, H. F. Olijhok, B. Verkaik, “Developments in Optical Disk Mastering,” Proc. Soc. Photo-Opt. Instrum. Eng. 529, 61 (1985).

1984 (1)

T. Murakami, “Design of the Pregroove-Shape on an Optical Disk Based on the Light Diffraction Analysis,” Trans. Jpn. IECE J67-C, 2 (1984) (in Japanese).

1983 (1)

Y. Tsunoda, S. Horigome, Z. Tsutsumi, “Optical Digital Data Storage Technologies with Semiconductor Laser Head,” Proc. Soc. Photo-Opt. Instrum. Eng. 382, 24 (1983).

1979 (1)

Hopkins, H. H.

Horigome, S.

Y. Tsunoda, S. Horigome, Z. Tsutsumi, “Optical Digital Data Storage Technologies with Semiconductor Laser Head,” Proc. Soc. Photo-Opt. Instrum. Eng. 382, 24 (1983).

Ito, O.

O. Ito, K. Yoshimoto, I. Watanabe, T. Kubo, “Improvement of Focusing and Tracking Servos in Optical Disk Memory,” Soc. Photo-Opt. Instrum. Eng. 529, 145 (1985).

Katoh, K.

H. Ukita, A. Watabe, K. Katoh, “MALS Head for Optical Recording,” in Technical Digest, Conference on Lasers and Electro-Optics (Optical Society of America, Washington, DC, 1983), paper WR2.

Kubo, T.

O. Ito, K. Yoshimoto, I. Watanabe, T. Kubo, “Improvement of Focusing and Tracking Servos in Optical Disk Memory,” Soc. Photo-Opt. Instrum. Eng. 529, 145 (1985).

Murakami, T.

T. Murakami, “Design of the Pregroove-Shape on an Optical Disk Based on the Light Diffraction Analysis,” Trans. Jpn. IECE J67-C, 2 (1984) (in Japanese).

Olijhok, H. F.

J. H. T. Pasman, H. F. Olijhok, B. Verkaik, “Developments in Optical Disk Mastering,” Proc. Soc. Photo-Opt. Instrum. Eng. 529, 61 (1985).

Pasman, J. H. T.

J. H. T. Pasman, H. F. Olijhok, B. Verkaik, “Developments in Optical Disk Mastering,” Proc. Soc. Photo-Opt. Instrum. Eng. 529, 61 (1985).

Tsunoda, Y.

Y. Tsunoda, S. Horigome, Z. Tsutsumi, “Optical Digital Data Storage Technologies with Semiconductor Laser Head,” Proc. Soc. Photo-Opt. Instrum. Eng. 382, 24 (1983).

Tsutsumi, Z.

Y. Tsunoda, S. Horigome, Z. Tsutsumi, “Optical Digital Data Storage Technologies with Semiconductor Laser Head,” Proc. Soc. Photo-Opt. Instrum. Eng. 382, 24 (1983).

Ukita, H.

H. Ukita, A. Watabe, K. Katoh, “MALS Head for Optical Recording,” in Technical Digest, Conference on Lasers and Electro-Optics (Optical Society of America, Washington, DC, 1983), paper WR2.

Verkaik, B.

J. H. T. Pasman, H. F. Olijhok, B. Verkaik, “Developments in Optical Disk Mastering,” Proc. Soc. Photo-Opt. Instrum. Eng. 529, 61 (1985).

Watabe, A.

H. Ukita, A. Watabe, K. Katoh, “MALS Head for Optical Recording,” in Technical Digest, Conference on Lasers and Electro-Optics (Optical Society of America, Washington, DC, 1983), paper WR2.

Watanabe, I.

O. Ito, K. Yoshimoto, I. Watanabe, T. Kubo, “Improvement of Focusing and Tracking Servos in Optical Disk Memory,” Soc. Photo-Opt. Instrum. Eng. 529, 145 (1985).

Yoshimoto, K.

O. Ito, K. Yoshimoto, I. Watanabe, T. Kubo, “Improvement of Focusing and Tracking Servos in Optical Disk Memory,” Soc. Photo-Opt. Instrum. Eng. 529, 145 (1985).

J. Opt. Soc. Am. (1)

Proc. Soc. Photo-Opt. Instrum. Eng. (2)

J. H. T. Pasman, H. F. Olijhok, B. Verkaik, “Developments in Optical Disk Mastering,” Proc. Soc. Photo-Opt. Instrum. Eng. 529, 61 (1985).

Y. Tsunoda, S. Horigome, Z. Tsutsumi, “Optical Digital Data Storage Technologies with Semiconductor Laser Head,” Proc. Soc. Photo-Opt. Instrum. Eng. 382, 24 (1983).

Soc. Photo-Opt. Instrum. Eng. (1)

O. Ito, K. Yoshimoto, I. Watanabe, T. Kubo, “Improvement of Focusing and Tracking Servos in Optical Disk Memory,” Soc. Photo-Opt. Instrum. Eng. 529, 145 (1985).

Trans. Jpn. IECE (1)

T. Murakami, “Design of the Pregroove-Shape on an Optical Disk Based on the Light Diffraction Analysis,” Trans. Jpn. IECE J67-C, 2 (1984) (in Japanese).

Other (1)

H. Ukita, A. Watabe, K. Katoh, “MALS Head for Optical Recording,” in Technical Digest, Conference on Lasers and Electro-Optics (Optical Society of America, Washington, DC, 1983), paper WR2.

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Figures (8)

Fig. 1
Fig. 1

Schematic diagram of optical head.

Fig. 2
Fig. 2

Waveform: (1) focusing error signal, (2) tracking error signal.

Fig. 3
Fig. 3

Focus servo error and track signal efficiency vs edge gradient.

Fig. 4
Fig. 4

Light intensity vs edge gradient.

Fig. 5
Fig. 5

Definition of the coordinate.

Fig. 6
Fig. 6

Calculated results for a triangular shape.

Fig. 7
Fig. 7

Permissible range of edge gradient for each width.

Fig. 8
Fig. 8

Permissible range of groove depth for each width.

Equations (4)

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T = ( P a - P b ) / P 0 .
U ( u ) 1 λ d f ( x ) exp [ j ϕ ( x ) ] exp ( - j 2 π λ r ) d x , r = ( x - u ) 2 + d 2 , f ( x ) = exp [ - x 2 ( A + B i ) ] , 1 / A = w 0 2 [ 1 + ( λ d π w 0 2 ) ] , 1 / B = λ d π [ 1 + ( π w 0 2 λ d ) ] .
Δ T = { 0 L / 2 U ( u ) 2 d u - - L / 2 0 U ( u ) 2 d u } / - U ( u ) 2 d u ;
P 0 = - L / 2 L / 2 U ( u ) 2 d u .

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